Home
Class 12
PHYSICS
A galvanometer has a coil of resistance ...

A galvanometer has a coil of resistance `100 Omega` and gives a full-scale deflection for `30 mA` current. If it is to work as a voltmeter of `30 V` range, the resistance required to be added will be

A

`1000Omega`

B

`900Omega`

C

`1800Omega`

D

`500Omega`

Text Solution

Verified by Experts

The correct Answer is:
2
Let required resistance b e R then `(R+R_(g))I_(g)=VrArr(R+100)(30xx10^(-3))=30`
`rArrR=900Omega`
Promotional Banner

Topper's Solved these Questions

  • CIRCULAR MOTION

    ALLEN|Exercise EXERCISE (J-A)|6 Videos

  • GEOMETRICAL OPTICS

    ALLEN|Exercise subjective|14 Videos

Similar Questions

Explore conceptually related problems

A galvanometer has a a coil resistance 100 ohm and gives a full scale deflection for 30 mA current. If it is to work as a voltmeter of 30 volt rang, the resistance required to be added will be

A galvanometer with a coil of resistance 50 Omega shows full-scale deflection when 10 mA current passes through it.

A galvanometer has resistance of 7Omega and given a full scale deflection for a current of 1.0A . How will you convert it into a voltmeter of range 10V

A galvanometer has a resistance 100Omega and gives a full scale deflection for a current of 0.1 A. It is to be converted into a voltmeter of range of 50 V. The resistance of voltmeter so formed is

A galvanometer has a resistance of 118Omega and gives full scale deflection for a current of 50 m A. if it is required to convert into an ammeter of range 3A, the shunt resistance should be

A moving coil galvanometer of resistance 50 Omega gives a full scale deflection , when a current of 0.5 m A is passed through it. To convert it to a voltmeter of range , 10 V , the resistance required to be placed in series is

A moving coil galvanometer of resistance 40 Omega gives full scales deflection when a current of 0.25 mA is paased through it. To convert it to voltmeter of range 10 V, the resistance requried to be placed in series is

A galvanometer of internal resistance 100 Omega has a full scale deflection current of 1mA . To convert it into a voltmeter of range 0-10V , the resistance to be connected is

ALLEN-CURRENT ELECTRICITY-All Questions
  1. In the shown arrangement of the experiment of the meter bridge if AC c...

    Text Solution

    |

  2. A potentiometer circuit is setup as shown. The potential gradient acro...

    Text Solution

    |

  3. A galvanometer has a coil of resistance 100 Omega and gives a full-sc...

    Text Solution

    |

  4. Consider the following two statements: (A)Kirchhoff's junction law f...

    Text Solution

    |

  5. For a the current loops shown in the figu re, kirchhoff's loop rule f...

    Text Solution

    |

  6. In a potentiometer arrangment, a cell of emf 1.25 V gives a balance po...

    Text Solution

    |

  7. A current of 2 A flows through a 2 Omega resistor when connected acros...

    Text Solution

    |

  8. If power dissipated in the 9 Omega resistor in the resistor shown is 3...

    Text Solution

    |

  9. In the circuit shown in the figure, if potentail at point A is taken t...

    Text Solution

    |

  10. A galvanometer of resistance G is shunted by a resistance S ohm. To...

    Text Solution

    |

  11. A thermocouple of negligible resistance produces an emf fo 40 mu V//^(...

    Text Solution

    |

  12. Figure shows three resistor configurations R1,R2 and R3 connected to 3...

    Text Solution

    |

  13. A ring is made of a wire having a resistance R(0) = 12 Omega. Find the...

    Text Solution

    |

  14. If voltage across a bulb rated 22 volt 100 watt drops by 2.5% of its r...

    Text Solution

    |

  15. In the circuit shown the cells A and B have negligible resistance. For...

    Text Solution

    |

  16. A milli voltmeter of 25 milli volt range is to be converted into an am...

    Text Solution

    |

  17. The power dissipated in the circuit shown in the is 30 watts. The valu...

    Text Solution

    |

  18. A cell having an emf E and internal resistance r is connected across a...

    Text Solution

    |

  19. A voltmeter reads the potential difference across the terminals of an ...

    Text Solution

    |

  20. Six resistances each of v ale r=6Omega are connected between points A,...

    Text Solution

    |